Effect of ram exposure at the end of progestagen treatment on estrus synchronisation and fertility during the breeding season in ewes

Evans, A.C.O.; Duffy, Patrick E.; Crosby, T.F.; Hawken, Penny; Boland, M.P.; Beard, A.P.

doi:10.1016/j.anireprosci.2003.12.013

Cited by 64 publications

(48 citation statements)

References 28 publications

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“…On the other hand, the estrus response in group B (58.5 %) obtained in this study is higher than the 20 % obtained by Omontese et al (2010) sponges. This variation may be due to effect of age and parity, breed, nutrition, treatment protocol, location, management and climate (Mani et al, 1992;Romano, 2002;Evans et al, 2004). In the present study, most does in group A exhibited estrus earlier (p<0.05) and mostly within the first 72 hours after sponge withdrawal, while does in group B showed estrus behavior much later (Table 1).…”

Section: Discussionmentioning

confidence: 51%

Induction of estrus in Sahel goats using Fluorogestone Acetate (FGA) sponges and Equine Chorionic Gonadotrophin (ECG)

Omontese¹,

Rekwot²,

Makun³

et al. 2012

Sokoto J. Vet. Sc.

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The objective of the present study was to evaluate the effect of a progestagen treatment alone or in combination with equine chorionic gonadotrophin (eCG) on estrus response in Sahel (SH) goats. One hundred (n=100) SH does were treated with 30 mg fluorogestone acetate (FGA) sponge for 14 days. At the end progestagen treatment, does that retained the intravaginal pessary were allocated into two groups; A: FGA & eCG (n=42) and B: FGA (n=41). Does in group A received additional 200 IU eCG i.m. concurrent with sponge removal. Estrus was detected twice daily (at 07.00 -10.00 and 15.00 -18.00 h) using sexually active bucks for 5 days after pessary removal. Estrus response was different (p<0.05) between A (73.8 %) and B (58.5 %). Estrus onset for group A and B (Mean ± S.E.M.) was 27.9 ± 8.3 and 38.4 ± 9.6 h while estrus duration (Mean ± S.E.M.) for group A and B was 35.8 ± 3.2 and 23.1 ± 5.2 h, respectively. Estrus onset and duration of estrus were different (p<0.05) between group A ( FGA & eCG) and B (FGA). It is concluded that additional eCG treatment following a 14-day progestagen (Fluorogestone acetate) treatment increased estrus response, hastened onset of estrus, lengthened duration of estrus and improved tightness of synchrony in Sahel does.

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Section: Discussionmentioning

confidence: 51%

Induction of estrus in Sahel goats using Fluorogestone Acetate (FGA) sponges and Equine Chorionic Gonadotrophin (ECG)

Omontese¹,

Rekwot²,

Makun³

et al. 2012

Sokoto J. Vet. Sc.

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“…The use of vaginal progestin pessaries along with gonadotropin administration has been the method of choice for oestrus synchronisation in sheep and goats (Wildeus, 2000). This method has been used for oestrus induction (Zarkawi et al, 1999) and synchronisation (Evans et al, 2004) programmes. The responses of different breeds of sheep to oestrus synchronisation may vary [Reviewed by Wildeus (2000)].…”

Section: Introductionmentioning

confidence: 99%

The effect of breed type and lactation status on reproductive performance in

Kridli¹,

Abdullah²,

Husein³

2010

SA J. An. Sci.

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This study was conducted to evaluate the effect of breed types and lactation status on reproductive performance of hormonally-treated Awassi ewes. A total of 282 ewes were treated with intravaginal progestagen sponges and equine chorionic gonadotropin. Ewes were mated with fertile rams following sponge removal. Lambing rate was similar between brown-and black-faced ewes, while the percentage of multiple births, fecundity and prolificacy were greater in black-faced ewes. Lambing rate and the percentage of multiple births were similar between lactating and dry ewes. Fecundity tended to be greater in lactating ewes, while prolificacy was similar regardless of lactation status. Results of the present study indicate that black-faced Awassi ewes respond better to hormonal treatment than brown-faced ewes while the lactation status does not appear to influence the ewes' response to hormonal treatment. ________________________________________________________________________________

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“…However, when compared with another study on Karakul ewes (Hashemi et al, 2006), the overall estrus response observed in this study (75.0% vs 93.3%) was lower. This might be attributed to the estrus enhancing effect of gonadotrophins administered at progestagen removal in their study, or to differences associated to the breed, location, management, season and nutritional status of the ewes (Menegatos et al, 2003;Evans et al, 2004;Ungerfeld, 2011). Although the estrus response did not differ between groups, the time to onset of estrus was significantly shorter in ewes treated with FGA than in those treated with CIDR.…”

Section: ■ Discussionmentioning

confidence: 52%

Effet de l’acide ascorbique sur le taux de fécondation des brebis Yankasa après synchronisation de l’œstrus

Omontese

Adewuyi

Rekwot

et al. 2017

Rev. Elev. Med. Vet. Pays Trop.

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L’objectif de cette étude était d’évaluer les effets d’une administration d’acide ascorbique (AA) sur le taux de fécondation de brebis dont les chaleurs étaient induites par deux traitements à base de progestogènes. Des brebis de race Yankasa (n = 64) ont été réparties de façon égale en deux groupes. Dans l’un, les brebis ont été traitées avec un dispositif intravaginal de libération continue du médicament (CIDR). Dans l’autre, les brebis ont été traitées avec 45 mg d’acétate de fluorogestone (FGA) au moyen d’une éponge vaginale. Après le retrait des progestogènes, les brebis de chaque groupe exprimant des chaleurs ont été réparties en quatre sous-groupes : CIDR témoin (CDNN, n = 12), CIDR plus AA (CDAA, n = 11), FGA témoin (FGNN, n = 13) et FGA plus AA (FGAA, n = 12). La détection des chaleurs a été réalisée au moyen de béliers sexuellement actifs et laissés libres de s’accoupler avec les femelles. Le taux d’expression des chaleurs n’a pas différé entre les sous-groupes. L’intervalle entre le retrait des dispositifs et l’apparition des chaleurs a été significativement (p < 0,05) plus court chez les brebis du groupe FGA que chez celles du groupe CIDR (respectivement 30,35 ± 2,72 et 48,56 ± 7,52 heures). La durée de l’oestrus n’a pas différé (p < 0,05) entre les traitements (FGA 37,22 ± 4,22 et CIDR 39,75 ± 2,51 heures). Les taux de fécondation ont été comparables entre sous-groupes. En conclusion, l’administration d’AA lors du retrait des dispositifs progestogéniques n’a pas amélioré le taux de fécondation des brebis Yankasa.

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Effect of ram exposure at the end of progestagen treatment on estrus synchronisation and fertility during the breeding season in ewes

Cited by 64 publications

References 28 publications

Induction of estrus in Sahel goats using Fluorogestone Acetate (FGA) sponges and Equine Chorionic Gonadotrophin (ECG)

Induction of estrus in Sahel goats using Fluorogestone Acetate (FGA) sponges and Equine Chorionic Gonadotrophin (ECG)

The effect of breed type and lactation status on reproductive performance in

Effet de l’acide ascorbique sur le taux de fécondation des brebis Yankasa après synchronisation de l’œstrus

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